International Journal of Fisheries and Aquatic Studies
2018, Vol. 6, Issue 5, Part D
Effects of brood stock density and hapa net material on the production of Nile tilapia (Oreochromis niloticus L. 1758) fry at Shoa Robit integrated development project site, EthiopiaAuthor(s):
Solomon Melaku, Tewodros Abate, Tewodros Eshete, Teklewold Tadesse and P NatarajanAbstract:
In this study, the effects brood stock density and hapa net material on the fry output of Nile tilapia was conducted with the objectives of identifying the appropriate brood stock density for maximum fry production and ease of management and evaluating the effectiveness of three types of locally available shade nets as breeding hapas. The experiment was run with two brood stock densities (4fish/m2 and 8fish/m2) and three types of shade net materials (shadow net 30%, nursery plantation net and khaki fish net) with six treatments in duplicates. The result showed that higher brood stock density (8fishes/m2) gave significantly (P<0.05) higher total mean fry production (980.01±35.80 fry/m2), while, the lower brood stock density (4fishes/m2) gave lower total mean fry (596.5±16.20 fry/m2).on the other hand, The mean number of fry/female was inversely correlated with density in which the lower broods tock density (4fish/m2) gave significantly higher (198±5.40 fry/female) compared to the higher density (8fishes/m2) with 163.33±5.96 fry/female. No significant difference (p>0.05) was observed in total mean fry production among the agricultural shade nets used for both densities. The first clutch (day21) gave significantly higher (p<0.05) mean fry production of 390.33±39.93compared to the second (day 42) with mean fry production of 204.9±22.46 and third clutch (day 63) with mean fry production of 193±19.2. Whereas, there was no significant difference between the second and third clutches in this study.Pages: 296-300 | 571 Views 37 DownloadsDownload Full Article:
How to cite this article:
Solomon Melaku, Tewodros Abate, Tewodros Eshete, Teklewold Tadesse, P Natarajan. Effects of brood stock density and hapa net material on the production of Nile tilapia (Oreochromis niloticus L. 1758) fry at Shoa Robit integrated development project site, Ethiopia. Int J Fish Aquat Stud 2018;6(5):296-300.